The absolute essence of timeless rock music is contained in the music of Deep Purple's Machine Head . We already knew it then thirty years ago when we asked Ian Gillan and Roger Glover to share their recollections of making "Smoke on the Water",…

When entities outside of the rock world try to define it, I usually hold my breath and cover my eyes, but in 2008 the folks at Time- Life did a pretty impressive job collecting hard rock genre-defining classics from Deep Purple, Whitesnake,…